Katie Francis,12, set a new national cookie-selling record with 18,107 boxes on Sunday night.

Since then, she's raised the bar to aim for a personal record of 20,000 boxes by the end of March. She hopes to sell 100,000 boxes during her overall girl scout career, her mom DeLee Francis told USA TODAY Network.

"She's such a go-getter. She works countless hours," DeLee said. In 2013 and 2012, Katie held the state record for cookie sales. The six-grader felt it was a natural progression to go for a bigger goal this year.

Her recipe for success? Time. Commitment. And asking everyone she sees to buy a box. "Cookie selling is a lot of fun and I really enjoy doing it, Katie told USA TODAY Network. "I felt really happy that I could do anything because I accomplished such a huge goal."

Since the start of the cookie-selling season this winter, Katie's schedule has included selling, selling and more selling--from when she gets out of school until about 9:30 p.m. on weeknights and 12-13 hours on weekends, she said.

"When I get so many compliments, it just helps me to keep on going," Katie said. She added that the venture has taught her business and money management skills.

And what cookie is the top seller? Thin Mints®, hands down, her mom says. "They stand out by a pretty large percentage. Samoas® are a definite second."

Katie and DeLee did some research to find that the previous national record was held by Elizabeth Brinton. Brinton sold about 18,000 in one year in the 1980s and 100,000 boxes over her career as a girl scout.

Jaimie Siegal, director of marketing and communications at Girl Scouts of Western Oklahoma, told ABC News that the organization wants to wait until the selling period is over on March 30 to talk about Francis' record.